Air ventilation structure of shoe sole

Abstract

A ventilation structure of a shoe sole of the present invention includes the shoe sole ( 1 ) formed with a through hole ( 5 ) vertically passing therethrough. The through hole ( 5 ) is fitted with a ventilation part ( 6 ). The ventilation part ( 6 ) comprises a flange portion ( 60 ) and the projection ( 61 ). The flange portion ( 60 ) engages the upper surface ( 2 a ) of the shoe sole ( 1 ) so that the ventilation part ( 6 ) does not drop off the through hole ( 5 ). The projection ( 61 ) extends into the through hole ( 5 ). The projection ( 61 ) is provided with a vent hole ( 62 ) vertically passing therethrough for the passage of air.

What is claimed is:  
     
       1. A ventilation structure of a shoe sole for ventilating a space within the shoe, comprising: 
       a shoe sole including a through hole vertically passing through the shoe sole; and  
       a ventilation part being fitted into the through hole;  
       the ventilation part comprising:  
       a flange portion engaging with an upper surface of the shoe sole so as to prevent the ventilation part from dropping out of the through hole; and  
       a projection extending into the through hole partway; and  
       the projection including a vent hole formed vertically through the projection for the passage of air;  
       wherein the through hole is provided in a portion of the shoe sole, the portion being compressed in the vertical direction when the shoe sole is landed;  
       the ventilation part is fitted into the through hole so that the projection of the ventilation part is slidable with respect to the through hole;  
       a top of the flange portion is placed so that when the shoe sole is landed pressure from above is applied to the top of the flange portion.  
     
     
       2. The ventilation structure of a shoe sole as set forth in  claim 1 , wherein the through hole comprises a fitting hole portion defining an upper portion of the through hole for fitting the ventilation part therein, and a large diameter portion defining a lower portion of the through hole and having a larger diameter in comparison with the fitting hole portion; and 
       wherein the projection passes through the fitting hole portion and extends into a part of the large diameter portion and a lower end of the projection faces toward an opening of a lower edge of the large diameter portion.  
     
     
       3. The ventilation structure of a shoe sole as set forth in  claim 2 , wherein the large diameter portion is defined by a tapered hole portion that is gradually increased in hole diameter downward in a tapered shape, and wherein the tapered hole portion opens downward. 
     
     
       4. The ventilation structure of a shoe sole as set forth in  claim 1 , wherein the upper surface of the shoe sole is formed with a fitting recess around the through hole corresponding to the shape of the flange portion. 
     
     
       5. The ventilation structure of a shoe sole as set forth in  claim 1 , wherein the flange portion and the projection are integrally molded of an elastomer. 
     
     
       6. The ventilation structure of a shoe sole as set forth in  claim 5 , wherein the projection of the ventilation part comprises a hollow cylindrical portion and a disc portion formed with a plurality of vent holes. 
     
     
       7. The ventilation structure of a shoe sole as set forth in  claim 5 , wherein the ventilation part is formed of a material of which Young's modulus is larger than that of a midsole of the shoe sole. 
     
     
       8. The ventilation structure of a shoe sole as set forth in  claim 1 , 
       wherein the projection and the through hole define a clearance therebetween, whereby the ventilation part is fitted into the through hole so that the projection of the ventilation part is slidable with respect to the through hole.  
     
     
       9. A ventilation structure of a shoe sole for ventilating a space within the shoe, comprising: 
       a shoe sole including a through hole vertically passing through the shoe sole; and  
       a ventilation part being fitted into the through hole;  
       the ventilation part comprising:  
       a flange portion engaging with an upper surface of the shoe sole so as to prevent the ventilation part from dropping out of the through hole; and  
       a projection extending into the through hole partway; and  
       the projection including a vent hole formed vertically through the projection for the passage of air;  
       wherein the through hole comprises a fitting hole portion defining an upper portion of the through hole for fitting the ventilation part therein, and a large diameter portion defining a lower portion of the through hole and having a larger diameter in comparison with the fitting hole portion;  
       wherein the large diameter portion is defined by a tapered hole portion that is gradually increased in hole diameter downward in a tapered shape, and wherein the tapered hole portion opens downward; and  
       wherein the projection passes through the fitting hole portion and extends into a part of the large diameter portion and a lower end of the projection faces toward an opening of a lower edge of the large diameter portion.  
     
     
       10. A ventilation structure of a shoe sole for ventilating a space within the shoe, comprising: 
       a shoe sole including a through hole vertically passing through the shoe sole; and  
       a ventilation part being fitted into the through hole;  
       the ventilation part comprising:  
       a flange portion engaging with an upper surface of the shoe sole so as to prevent the ventilation part from dropping out of the through hole;  
       a projection extending into the through hole partway; and  
       the projection including a vent hole formed vertically through the projection for the passage of air;  
       wherein the flange portion and the projection are integrally molded of an elastomer and the ventilation part is formed of a material having a Young's modulus greater than that of a midsole of the shoe sole.